Locking device for rivet-seats.



PATENTED DEC. 13, 1904.

W. 0. LIPPERT. LOOKING DEVICE FOR RIVET SETS.

APPLIOATION FIIED NOV. 11 1903. N0 MODEL.

wwmw ww m UN Tnn STATES Patented December 13, 190&.

PATENT OFFICE.

WILLIAM C. LIPPERT, OF SALEM, OHIO, ASSIGNOR OF ONE-THIRD TO WILLIAM A.

MCGUIRE, OF BRADDOOK,

PENN SYL VANIA.

LOCKING DEVlCE FOR RlVET-SETS.

dated December 13, 1904.

Application filed November 11, 1903. Serial No. 180,708- (No model.)

To all whom it may concern:

Be it known that I, WILLIAM C. LIPPERT, a citizen of the United Statesof America, residing at Salem, in the county of Oolumbiana and State ofOhio, have invented certain new and useful Improvements in LookingDevices for Rivet-Sets and Li ke Tools, of which the following is aspecification, reference being had therein to the accompanying drawings.

This invention relates to certain new and useful improvements in lookingdevices for rivet-sets and like tools; and the invention is particularlydesigned for and adapted to be used for the securing or locking inposition of the rivet-set in the end of a pneumatic hammersleeve or forthe securing of other equivalent tool to the rivet-set in position.

In the use of pneumatic hammers the rivetset,sometimes termed a buttonand also quite generally termed in the trade the snap, works orreciprocates freely in the end of the cylinder of the hammer, it beingheld when the hammer is in use against displacement under the pressureof the air by reason of its being placed in engagement with the rivetbeing operated upon. It frequently happens, however, that the airpressure is inadvertently or accidentally turned into the cylinder whenthe rivet-set is not in position with the work, and consequently theplunger in the cylinder, moving forward under air-pressure, strikes theinner end of the rivet-set and forces the rivetset out of its socket inthe end of the sleeve or cylinder with great force and endangeringthesafety, if not the life, of workmen in the vicinity. The rivet-set inthis class of tools must of necessity reciprocatein the end of thesleeve or cylinder in order that after each blow of the piston orplunger in the cylinder the rivet-setmay recede to receive thesucceeding impact of the piston or plunger to effect the heading of therivet.

It is the object of my invention, therefore, to provide means forpermitting the free reciprocation of the rivet-set as required, but toso secure the rivet-set in the end of the barrel or sleeve that in eventof the plunger or piston being driven forward when the rivetset is notin engagement with a rivet or other object to receive the force of theblow the rivet-set will be retained in the end of the cylinder and nodamage will be done.

In describing my invention in detail reference will be had to theaccompanying drawings, forming a part of this ap ilication, and whereinlike numerals of reference will be employed for designating-like partsthroughout the different views of the drawings, in which- Figure l is aside elevation of a pneumatic hammer, partially in longitudinalsection,illus trating one form of my invention. Fig. 9. is a transversevertical sectional view taken on line 2 2 of Fig. 1. Fig. 3 alongitudinal sectional view of a cl1iselsleeve employed to receive therivet-set or other toolin some forms of pneumatic hammers. Fig. at is alongitudinal sectional view of a part of a hammer em ploying thechisel-sleeve construction, showing the adaptation of my inventionthereto. Fig. 5 is a view of means for locking the pin.

In the accompanying illustration of my invention I have shown the samein connection with the holding of a rivet-set, button, or snap as thetool beingheld; but 1 do not wish to be understood as confining myselfto the adaptation of the invention to the holding of this form of toolalone, as the invention is equally applicable to the holding of othertools employed in pneumatic hammers and like devices. .lrl aving usedthe rivet-set or button for illustrativepurposes, I will describe thesame in detail.

In the accompanying drawings, 1 indicates the cylinder of the pneumatichammer, the nose 2 of which is in practice bored longitudinally toreceive the shank or stem 3 of the rivet-set or button 4:, the inner endof the stem or shank 3 being adapted to receive the impact of the pistonor plunger Where the shank or stem of the rivet-set or button is fitteddirect into the bore in the end of thecylinder or sleeve 1, as shown inFig. l, I provide the nose end of the sleeve or cylinder with an inn,terror annular groove b, so disposed w1th1n the nose end of the sleeveor cylinder as to g beyond the periphery leave bearings 7 8 at each sideof the groove 6 for the shank or stem. I then provide the shank or stem3 with a recess-cavity 9, in which is placed a coil-spring 10 of desiredstrength, and dispose in the cavity or recess on top of the spring a pin11, which projects of the shank of stem 3 and works in the annulargroove 6, the latter being made of sufficient width to allow of the fullreciprocation or stroke of the rivet-set or button. In case it isdesired to remove the rivet-set or button (or other tool) an instrument,such as a small nail, may be inserted through an aperture 12, providedin the nose end of the sleeve or cylinder and engaged with the pin 11 todepress the latter and compress spring lO, whereby to permit the removalof the tool, as will be apparent.

It is sometimes the practice to employ a chisel-sleeve or bearing-sleevein the nose end of the sleeve or cylinder, in which sleeve the shank ofthe tool reciprocates, and the adaptation of my invention to this formof tool is shown in Figs. 3 and 4. In this construction I provide thechisel-sleeve or bearing-sleeve 14 with a grooved-out portion 15 at itsinner end, which grooved-out portion receives the locking-pin 11, thatis mounted in the shank or stem in the same manner as aforedescribed.The opening 12 in the nose end of the sleeve or cylinder in thisconstruction is also extended through the sleeve 14, as shown in Figs. 3and L. In order to prevent the pin from falling out of this socket whenthe rivet-set or other tool is removed from the hammer, I provide a lockfor the pin of suitable construction, a practical embodiment of which isto provide the pin with a stud 10 to engage in a bayonet-shaped slot 11,so constructed as to allow for the vertical reciprocation of thelocking-pin as may be required.

In either of the constructions shown and described it will be apparentthat the principle involved is identical and that while the freerequired reciprocation of the shank of the tool is provided for yet thetool will be securely locked against being driven out of the hammer inevent of its not being in engagement with the work when the piston orplunger strikes the same and all danger or injury to the workmenobviated.

While I have described in detail and illustrated adaptations of theinvention, yet I do not wish to unduly confine myself in construction.as it will be evident that various changes may be made in the details ofconstruction as may be required according to the tool to be held withoutdeparting from the general spirit of the invention.

Having fully described my invention, What I claim as new, and desire tosecure by Letters Patent, is

The combination with the grooved cylinder and the tool-shank bearingtherein, said shank having a recess formed therein, a locking-pin insaidrecess, a spring seating in the recessbottom and bearing against thepin, the cylinder having an aperture therein whereby access may begained to said pin to depress the same by use of some instrument or thelike capable of entering said cylinder-aperture.

In testimony whereoi'I afiiX my signature in the presence of twowitnesses.

WILLIAM C. LIPPERT.

Witnesses E. H. HU'IZEN, J. A. LIPPERT.

